Fed 210 vs 210M Diameter

parshal

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Joined
Apr 29, 2002
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Colorado
I was priming some ADG 6.5 SS brass with Fed 210's and 210M's to do some comparison with the Labradar. It took about 20 shells to realize all the 210's felt loose and the 210M's felt tight. It was one of those "DOH!" moments. Measuring diameter I found the 210M's to be .0005-.001" larger in diameter. Maybe this is common knowledge but it surprised me.

Just FYI for those that start finding loose primer pockets.
 
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